Question 1

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

Accepted Answer

A) 38 cm 
B) 24 cm 
C) 18 cm 
D) 9.3 cm 
E) 5.9 cm

Question 2

When applying the scientific method, a model or theory should be based on experimental data.

Accepted Answer

A) True 
 B)False

Question 3

Select the best statement.

Accepted Answer

A) Physical changes may be reversed by changing the temperature. 
B) Physical changes alter the composition of the substances involved. 
C) Physical properties are not valid characteristics for identifying a substance. 
D) Physical properties are mostly extensive in nature. 
E) Physical changes are usually accompanied by chemical changes.

Question 4

You prepare 1000. mL of tea and transfer it to a 1.00-quart pitcher for storage. Which of the following statements is true?

Accepted Answer

A) The pitcher will be filled to 100% of its capacity with no tea spilled. 
B) The pitcher will be filled to about 95% of its capacity. 
C) The pitcher will be filled to about 50% of its capacity. 
D) The pitcher will be completely filled and a small amount of tea will overflow. 
E) The pitcher will be completely filled and most of the tea will overflow.

Question 5

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

Accepted Answer

A) 6.1 × 10 5 km 
B) 5.3 × 10 5 km 
C) 3.9 × l0 5 km 
D) 1.5 × 10 5 km 
E) 9.4 × 10 4 km

Question 6

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

Accepted Answer

A) True 
 B)False

Question 7

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Accepted Answer

A) Theory 
B) Hypothesis 
C) Law 
D) Experiment 
E) Definition

Question 8

Which of the following correctly expresses 52,030.2 m in scientific notation?

Accepted Answer

A) 5.20302 × 10 4 m 
B) 5.20302 × 10 5 m 
C) 5.203 × 10 4 m 
D) 5.20 × 10 4 m 
E) 5.2 × 10 4 m

Question 9

Select the best statement.

Accepted Answer

A) Chemical changes provide the only valid basis for identification of a substance. 
B) Chemical changes are easily reversed by altering the temperature of the system. 
C) Chemical changes always produce substances different from the starting materials. 
D) Chemical changes are associated primarily with extensive properties. 
E) Chemical changes are accompanied by changes in the total mass of the substances involved.

Question 10

Which of the following correctly shows how to convert a density of 20.1 g cm−3 to units of kg m−3?

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 11

The result of (3.8621 × 1.5630) − 5.98 is properly written as

Accepted Answer

A) 0.06. 
B) 0.056. 
C) 0.0565. 
D) 0.05646. 
E) 0.056462.

Question 12

Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm3, 4.67 g/cm3, 4.69 g/cm3, and 4.81 g/cm3. Independent studies found the correct density to be 4.75 g/cm3. Which of the following statements represents the best analysis of the data?

Accepted Answer

A) Bud's results have much greater accuracy than precision. 
B) Bud's results have much greater precision than accuracy. 
C) Bud's results have high accuracy and high precision. 
D) Bud's results have low accuracy and low precision. 
E) Bud's equipment is faulty.

Question 13

Which of the following abbreviations of the given SI base unit is incorrect?

Accepted Answer

A) second: s 
B) kilogram: kg 
C) kelvin: K 
D) mole: m 
E) ampere: A

Question 14

Which one of the following numbers contains a digit or digits which is/are not significant?

Accepted Answer

A) 970.0 
B) 502 
C) 0.300 
D) 0.0043 
E) 20.01

Question 15

The difference between a student's experimental measurement of the density of sodium chloride and the known density of this compound reflects the __________ of the student's result.

Accepted Answer

A) accuracy 
B) precision 
C) random error 
D) systematic error 
E) indeterminate error

Question 16

A scientist made careful measurements of the pressure and temperature of many different gases. Based on these measurements, he concluded that "the pressure of a fixed amount of gas, measured at constant volume, is directly proportional to its absolute temperature." This statement is best described as a

Accepted Answer

A) theory. 
B) hypothesis. 
C) law. 
D) experiment. 
E) definition.

Question 17

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

Accepted Answer

A) 269.01860 cm 
B) 269.0186 cm 
C) 269.019 cm 
D) 269.02 cm 
E) 269.0 cm

Question 18

The appropriate number of significant figures in the result of 15.234 − 15.208 is

Accepted Answer

A) 1. 
B) 2. 
C) 3. 
D) 4. 
E) 5.

Question 19

Water vapor is less dense than ice because

Accepted Answer

A) molecules in the gas phase are in constant motion. 
B) molecules in the gas phase have more potential energy than in solids. 
C) molecules in the gas phase have more kinetic energy than in solids. 
D) gaseous molecules have less mass. 
E) molecules in the gas phase have more space between them than in solids.

Question 20

Which of the following is not an SI base unit?

Accepted Answer

A) Meter 
B) Ampere 
C) Second 
D) Gram 
E) Kelvin

Exam 1: Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

A large pizza has a diameter of 15 inches. Express this diameter in centimeters.

When applying the scientific method, a model or theory should be based on experimental data.

Select the best statement.

You prepare 1000. mL of tea and transfer it to a 1.00-quart pitcher for storage. Which of the following statements is true?

The average distance between the Earth and the Moon is 240,000 miles. Express this distance in kilometers.

The numerical value of any temperature expressed in Celsius is always different from the numerical value of the same temperature in kelvin.

A dictionary has the following definition for a word: "A tentative explanation that accounts for a set of facts." Which of the following words best fits that definition?

Which of the following correctly expresses 52,030.2 m in scientific notation?

Select the best statement.

Which of the following correctly shows how to convert a density of 20.1 g cm⁻³ to units of kg m⁻³?

The result of (3.8621 × 1.5630) − 5.98 is properly written as

Bud N. Chemist must determine the density of a mineral sample. His four trials yield densities of 4.77 g/cm³, 4.67 g/cm³, 4.69 g/cm³, and 4.81 g/cm³. Independent studies found the correct density to be 4.75 g/cm³. Which of the following statements represents the best analysis of the data?

Which of the following abbreviations of the given SI base unit is incorrect?

Which one of the following numbers contains a digit or digits which is/are not significant?

The difference between a student's experimental measurement of the density of sodium chloride and the known density of this compound reflects the __________ of the student's result.

Select the answer with the correct number of decimal places for the following sum: 13.914 cm + 243.1 cm + 12.00460 cm =

The appropriate number of significant figures in the result of 15.234 − 15.208 is

Water vapor is less dense than ice because

Which of the following is not an SI base unit?